diff --git a/openbox/actions/if.c b/openbox/actions/if.c
index a9c4094b3..7759754b2 100644
--- a/openbox/actions/if.c
+++ b/openbox/actions/if.c
@@ -66,6 +66,8 @@ typedef struct {
     gboolean decor_on;
     gboolean omnipresent_on;
     gboolean omnipresent_off;
+    gboolean fullscreen_on;
+    gboolean fullscreen_off;
     gboolean desktop_current;
     gboolean desktop_other;
     guint    desktop_number;
@@ -185,6 +187,7 @@ static void setup_query(Options* o, xmlNodePtr node, QueryTarget target) {
     set_bool(node, "urgent", &q->urgent_on, &q->urgent_off);
     set_bool(node, "undecorated", &q->decor_off, &q->decor_on);
     set_bool(node, "omnipresent", &q->omnipresent_on, &q->omnipresent_off);
+    set_bool(node, "fullscreen", &q->fullscreen_on, &q->fullscreen_off);
 
     xmlNodePtr n;
     if ((n = obt_xml_find_node(node, "desktop"))) {
@@ -385,6 +388,11 @@ static gboolean run_func_if(ObActionsData *data, gpointer options)
         if (q->omnipresent_off)
             is_true &= query_target->desktop != DESKTOP_ALL;
 
+        if (q->fullscreen_on)
+            is_true &= query_target->fullscreen;
+        if (q->fullscreen_off)
+            is_true &= !query_target->fullscreen;
+
         gboolean is_on_current_desktop =
             query_target->desktop == screen_desktop ||
             query_target->desktop == DESKTOP_ALL;